package org.apache.ibatis.reflection.property;

import org.apache.ibatis.reflection.ReflectionException;

import java.util.Locale;

/**
 * 入参都是方法名
 *
 * @author Clinton Begin
 */
public final class PropertyNamer {

    private PropertyNamer() {
        // Prevent Instantiation of Static Class
    }

    /**
     * 由get/set方法名直接获取属性名
     *
     * @param name
     * @return
     */
    public static String methodToProperty(String name) {
        if (name.startsWith("is")) {
            name = name.substring(2);
        } else if (name.startsWith("get") || name.startsWith("set")) {
            name = name.substring(3);
        } else {
            throw new ReflectionException("Error parsing property name '" + name + "'.  Didn't start with 'is', 'get' or 'set'.");
        }

        // 首字母转小写， 若前两个字母均为大写 则直接返回
        if (name.length() == 1 || (name.length() > 1 && !Character.isUpperCase(name.charAt(1)))) {
            name = name.substring(0, 1).toLowerCase(Locale.ENGLISH) + name.substring(1);
        }

        return name;
    }

    /**
     * 通过方法名来判断是否为类属性
     *
     * @param name
     * @return
     */
    public static boolean isProperty(String name) {
        return name.startsWith("get") || name.startsWith("set") || name.startsWith("is");
    }

    /**
     * 通过方法名来判断是否为类getter方法
     *
     * @param name
     * @return
     */
    public static boolean isGetter(String name) {
        return name.startsWith("get") || name.startsWith("is");
    }

    /**
     * 通过方法名来判断是否为类setter方法
     *
     * @param name
     * @return
     */
    public static boolean isSetter(String name) {
        return name.startsWith("set");
    }

}
